package cn.tedu.sp06.fb;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
@Component
public class OrderFB implements FallbackProvider {
    /**
     *  * 用6调用2会有延迟，被6捕获通过降级熔断进行处理,Zuul自动启用Hystrix
     *  * 1.错误提示
     *  * 2.缓存数据
     *  * 3.根据业务逻辑返回数据*/

    /**
     * 设置对哪个服务应用当前降级类
     *  item-service: 对商品服务降级
     *  也可以写  *  对所有服务都降级
     *  null也是对所有服务都降级
     *  */
    @Override
    public String getRoute() {
        return "order-service";
    }

    /***/
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            /*状态码封装对象，封装状态码和状态文本*/
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }
            /*原始状态码，将状态码拿出返回*/
            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }
            /*返回状态文本，将文本拿出来*/
            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {
                //用来关流InputStream
                //ByteArrayInputStream不占用底层系统资源，不需要关闭
                //可以为空
            }

            @Override
            public InputStream getBody() throws IOException {
                //JsonResult -- {code:500,msg:调用后台错误，data:null}
                String json = JsonResult.build().code(500).msg("调用后台服务出错").toString();
                new ByteArrayInputStream(json.getBytes("UTF-8"));
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h = new HttpHeaders();
                h.add("Content-Type","application/json;charset=UTF-8");
                return h;
            }
        };
    }
}
